I have to speak in front of big groups once in awhile and yeah I always get nervous too, it's one of my least favorite things. Even my old boss who would speak in front of about 100 people every week (and was great at it!) said she got nervous every time and had butterflies in her stomach.

On a FN show I saw last week Bobby Flay said he gets nervous every single time he gets in front of the camera..I think it's very common, lots of people get nervous about public speaking.

I also have a friend who went to Toastmasters and said it helped a great deal in her career - she does corporate training to large groups of people and is more comfortable doing it now.